Just bought brand new hoover fridge freezer which, on advice from deliverer, was left 3 hrs switched off, then switched on 4 hrs later but no cooling at all.
If anything it is warmer inside than outside temp.

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HiIs your fridge compressor motor working and can you hear it turn on and off every hour or so. Not to be confused with the sound coming from the fan inside the fridge.If the motor is working but neither the fridge or freezer compartment are getting cold, then there may have been a rupture during transport and gas has escaped.Ash

1. is light on in side when you open the door. If not check breakers or fuses.2. Can you hear the compressor running. If not do you hear any clicking sounds.3. If you hear clicking sounds, try putting a fan on compressor and unplug refrigerator.4. Wait one hour.5. plug back in. If compressor starts let it run and see if it cools, if it doesnt, call service man.6. If it goes back to clicking, call a service man. Try this and let me know.

i just want to say that i have the same fridge freezer and that is whats happening to mine. even the drinks are freezing aswell as tomatoes and any other thing that is put in there. after reading your problem im thinking maybe this is a manufacturing fault. i am about to buy an extended warrenty for mine then i can get the poeple to fix it as mine is also 3yrs old. hope that helps.

Try removing everything out of your fridge, switch it off and open all doors for 12 hrs. Then close doors and switch it on for another 24 hrs before putting in you stuff. most likely the evaporator is iced up, you need to defrost if fully.

I have the same problem and have talked to the manufacturer. They said to turn off the appliance for 24 hours then it should be good as new when you switch it back on. Obviously you'll have to find somewhere for your freezer contents. I'm going to try this myself tonight.

have you tried turning down the temperature for the freezer or fridge? The fridge gets its cold power from the freezer, it is siphoned into it. So turning down the freezer temp may help but a sensor may have gone bad in the motherboard of your freezer and not closing off the vent into your fridge

Try these solutions in these order:
1. Switch off the fridge and leave the door open overnight. Switch it back on in the morning.
Explanation: The sensor inside the fridge gets frozen and cannot control the temperature properly.
2. Switch off the fridge. Unplug it. At the back of the fridge (behind the unit, not inside) there is a large grid. Clean it with a hoover thoroughly. Open the fridge. Dry the back of the fridge if wet (inside the fridge). If frosted wait for it to defrost and then dry it. Plug in the fridge. Switch the fridge back on. This one worked for me.
Explanation: The dust in the grid deprives the fridge from cooling down and the unit can't control the temperature in the fridge section.
3. Switch off the fridge. -Unplug it. Empty it. Turn it upside down. Plug it in. Switch it on for 24 hours. Switch it off. Unplug, return to normal and switch on.
Explanation: This has to do with the pressure of the gas inside the compressor. I have not tried it but this advice as given to me by a qualified electrician when I commented the (in)famous F2 problem in Liebherr fridge/freezers.
Hope it helps. Regards. Albert